Drill.



c. L. ANTON'.A

DRILL.

APPLIGATION FILED MAY 15, 1913.

1,082,617. y Patented Dc. 3p, 1913.

@wm/nto@ C4 L- ANTON @JM y Losser?.

rra-n simens ATE cnmsrorn'en -LoRRANoE AN'roN, OEIMONONGAHELA,PENNSYLVANIA.

Darm.

T all whom z't'z'ag/ concern Y Be it known that. I, CHRISTOPHER Lon-RANcE ANTON, a citizen of the United States,

residing at Monongahela, in the county of Washington and State. ofPennsylvania,n

have invented certain new and useful Improvements in Drills, of whichthe following is a specification,,reference.beinghad" to theaccompanying-drawings.

- This invention relates to improvements 1n drills, and moreparticularly to that class ing a socket formed.' therein, a centralbitarranged in vthe socket, the central bit projecting outwardly beyondthe pairs of bits arranged in theopposite ends of the socket, thecentral bit being adapted tol start a hole, andthe side bits cutting ahole of the desired diameter. s

A still lfurther object of this invention 1s the provision of a drillcomprising a head having a socket formed'therein, the head being alsoprovided with a reduced tubular extension, a .central bit disposed inthe socket, and said bits arranged in the opposite ends of the' socket,the -central bit having a reduced threaded extension projecting throughthe extension of the head, and

a nut threaded on the extremity ofthe extension of the central-'bit tobear against the extremity of the extension ofthe head,

whereby the, several bits are'maint-ained in' positioninthe head.

With these and other objects 1n view, my

i invention consists in the 'novel construction,

combination. and arrangemetof parts, to be hereinafter more fullydescribed,cla1med and illustrated .fin the accompanying drawing,

in which-'- Figure l1 1san elevatlon of my device',

partly in section; Fig. 2 .is an elevation ofthe central bit; Fig. 3 isan elevation of one of thel side bits; and Fig. 4 is an end View; v ofthe head with the'bits removed.

Referring more particularly to, the drawing, the numeral 5 designatesthe drillhead Speccation of Letters Patent.

Patented Dec. 30, 1913.

Application filed may 15, 1913. seriaiNo. 767,846.

which is provided with a rearwardly projecting tubular extension 6,whereby the head may be secured to any desired construction of drillstock, (not shown). The head 5 is provided with an elongated-bore orsocket 7 which communicates at one end with a bore of the tubularextension 6, and the'bore is enlarged laterally and centrally thereof,as at 8 to afford recesses adapt-ed to receive the side faces of acentral lcutting bit 9 whereby the same .is maintained against axialmovement. The/ reduced extension 6 forms a shoulder`10 at the inner endof the head, and the central bit 9 is provided with la reduced threadedextension 11 which is adapted for engagement in thel bore of theextension 6 and projects therethrpugh. Arranged in the opposite sidesofthe socket 7 are side bits 12,'l the inner ends of the bitsl engagingthe.shou1 der '10 whereby the inward movement thereof is limited.- Theopposite faces of the centralbit 9 are beveled, as at 13, and the innerfaces of the bits '12 are beveled as at 14, at their inner ends, the

.beveled surfaces of the bit 9 being adapted toengage the beveledl innerfaces of the side bits 12 to maintain them in .the head.

The forward extremitylof' the central -bit is formed with a pair ofreversely extendingv vis position withinl cutting teeth' 15, .the teethprojecting beyond the outer yends of the bits'l2 which are curvedoutwardly, as at 16, to space, the same from the opposite faces of thebit9. It will be lseen that several sets of side bits 12 may be used inconnection with the drill, the bits being curved outwardly to relativelydifferent degrees', whereby openings of -any desired diameter may beformedin the wall of the mine,

liquely extending shoulders 17, which are. adapted`- to feed the slackor dirt cut bythe bits rearwardly of the head.

In the practicaluse jof my device, when' it is desiredto'connect theseveral bits to the` The outer fa'ce of the head 5` isformed withdiametrica-lly opposite ob y head, the side bits 12.' are arranged inthe opposite sides -of the socket-7, and the bit 9 .is disposed betweenthe side bits, so` that the.

reduced. -extension 11 thereof' projecting y through the bore of theextension '6, and the beveled surfaces'l on the opposite facesof .thecentral bit engage the -beveledinner faces of the bits 12. nut 18fisthreaded upon the projecting extremity of the extension 11,

' the nut being adapted to bear against the reduced extension 6 therebyserving to create .the requisite endwise. adjustment of the bit9 to lockthe side bits in operative vposition Within the head. From the abovedescription taken in connection with the accompanying drawing, it willbe seen that should any of the bits become bro-ken or dull, -they may bereadily removed by disengaging the nut 18 from the extension .l1 of thecentral bit,whereby new or sharpened bits may be readily secured in thehead.

- Having thus fully described my invention what I' desire to claim andsecure by Letters Patent is:

l. A drill comprising a head having a socket therein, the oppositekvvall's of such being provided with coacting means Whereby the same maybe maintained in operative position relatively to the head.

'2. A device of the character described comprising a. hollow head havinga tubular extension, a bit arranged centrally Within said y head andhaving a reduced extension projecting through said tubular extension,auxiliary bits arranged Within said head yupon opposite sides of theeentral'bit, the opposite faces of said central bit being beveledintermediate of itsends, the inner faces of said side bits bein beveledfor engagement With the beveled aces of said central bit, means mountedupon the extremity of the reduced extension of said central bit tomaintain said bits Within Said head, said central bit and the innerWalls or'l the head being provided with coacting means to hold saidcentral bit against axial movement.

In' testimony whereof I hereunto afiix my signature in the presence oftvvo Witnesses. h CHRISTOPHER LORRANCE ANTON. Witnesses:

WV. F. ALTERN, .JENNIE HAMMOND.

